LeAnn Rimes Shows Off 'Curves' Over July 4th Holiday (Photo)

LeAnn Rimes' slender physique has been criticized time and time again, but the newlywed actress certainly wasn't shy about showing off her skinny self in Malibu over the long weekend.

Donning only a red string bikini, Rimes took to Twitter to show off her "curves," tweeting black-and-white photos of herself on the beach on Sunday.

Rimes has been criticized about looking too skinny these days, causing her trainer, named Michael Jackson, to speak out in her defense.

"I know it really bothers her," Jackson told FOX411.com about all the press surrounding Rimes' body. "A lot of people see pictures of LeAnn and assume certain things. But we're in the process of putting a video together that she'll post to her blog so that people will see what it is that we're doing to get her in shape ... know she's really anxious to show people -- excuse my French -- that she takes her s**t seriously."

"With LeAnn, the one thing I do is boxing -- it's all about boxing," said Jackson. "We use hand mitts and boxing gloves."

Although some maybe-not-so-flattering pics of the actress looking very thin have popped up in recent months, Jackson said she's working hard to look healthy.

"She's really focused, and I think that's what a lot of people don't see -- all the hard work and dedication that she's put in," he said. "[Her weight] is not an issue -- this is [a result of] her lifestyle."

But last weekend was all about family fun for Rimes, who tweeted her patriotism on Monday.

"Happy 4th Of July!!!!! I hope everyone has a safe and blissful 4th w/ your family and friends," she wrote on Twitter.

I see no difference between the photos of her and Katie Holmes in her red bikini..same bones sticking out and no one is ragging on her..and these woman when they get away from the hairdressers and makeup artists are as plain as everyone else...they are just people who happen to have some sort of talent or celebrity status..isn't there something more important to talk about..seriously?

Not only is she skinny is disgusting looking....her personality is pretty vile as well. She has this "Im better than you" attitude. I used to be a huge fan when I was little. Not anymore. Terrible role model.